Blower



Nov. 25, 1947. :'R, A. MAYNE 2,431,648

BLOWER Filed Feb. 9, 1945 2 Sheets-Sheet 1 Nov. 25, 1947.

I R. A. MAYNE BLOWER Filed Feb. 9, 1945 v 2 Sheets-Sheet '2 Patented Nov. 2 5, 1947 UNITED STATES VPATENT ori-lcs Robert A. llflnlmn, 'Ohio appiiomonrebmry 9,1945, sei-m Nu. 511,060

(ci. aso-134) 18 Claims.

This invention relates to a blower and more particularly .to a blower of the centrifugal type.

In my copending application Serial No. 525,810 I disclose a method of spacing i'an blades by using extensions on 4each blade, which extension is equal .to the-pitch of the blades.

An object of this invention is to provide spacer means for accurately spacing the blades on a support, which spacer means may be utilized to lock the blades in position.

Another object of this invention is to provide a fan blade that is provided with a shoulder abutting the retaining support adapted to absorb the centrifugal force exerted upon the fan blade as itrotates.

Another object of this invention is to produce a strong, dependable, light weight fan oi' the centrifugal type from light weight material and a small amount of labor, resulting in a cheap, etllcient and economical blower.

Btlr objects and advantages result in the construction of parts, the combination thereof and the mode oi' operation, as will become more apparent from the following description.

vReferring to the drawings,

Figure 1" discloses a fragmentary perspective view of -a portion of a ian blade and a supporting ring. f

Figure 2 is a fragmentary end view of a supporting ring with one blade mounted in position.

Figure 3 is a perspective top plan view of one end of a fan blade ready for assembly.

Figure 4 is a cross sectional view oi! a portion of an end ring and a shroud ring, together with a portion of a blade.

Figure 5 is a perspective side elevational view of a Ian blade formed in readiness for assembly.

Figure 6 discloses a supporting assembly for the fan blades.

Figure 7 discloses a modiiication oi the supporting assembly with parts broken away and other parts shown in cross section, taken substantially on the line 1-1 of Figure 8.

Figure 8 discloses an end view of a portion of the supporting assembly shown in Figure 7 with a part of the fan assembly.

IIn the drawings, the reference character I0 indicates a fan blade that is provided with an extension I2 on each end. The extension I2 is provided with a hole I4 adapted to receive a pair of tongues I6 struck out from a band I8 that forms an end ring for the :ian when assembled. Thefan blade is provided with an undercut notch or slot forming a shoulder 22 abutting the inner periphery of the ring I8. The tongues I8 are bent into overlapping relation with respect to the edges of the hole I4, as clearly shown in Figure 2. The end 24 o! the extension I2 is bent inwardly, so as to engage the inner side of the ring or band I0. The tongues I6, the end 24 and the shoulder 22 cooperate to hold the ian blade in ilxed spaced relation with respect to the ring forming the support. The tongues I8, in addition to holding the fan blade in position, also provide spacers for accurately spacing the ran blades with respect to each other.

'I'he blades I0 may be assembled upon a pair of bands I8, one for each end, the tongues I8- bent into position, the ends 24 clamped against the inner side of the bands and then thebands may be placed in a suitable jig or ilxture so as to form the bands and the blades into cylindrical formation. The ends of the bands I8 may be spot welded or otherwise secured together. This results in a blower that is easily assembled by inexperienced labor, requiring a very small degree of skill.

The Ian blades when completely assembled, together with the rings, may be dipped into a galvanizing solution, which forms a protective coating and tends to bond the parts together.

If it is found necessary to -reenforce the end rings or improve upon the appearance of the fan assembly, a pair of shroud rings 30, L-shaped in cross sectional area, may bepress-iltted upon the end rings I8, the extensions I2 and the tongues I6. These shroud rings reenforce the ends of the assembly, so as to provide a rigid end assembly and at the same time conceal the extensions I2 and the tongues I8. Whenever the fan rotates, the shoulders 22 absorb the centrifugal force, so as to relieve the strain that tends to bend the extensions -I 2 and the tongues I6.

A suitable support for the fan assembly may be provided in any manner, so as to mount the fan assembly on any shaft transmitting power to the blower and providing an axis of rotation therefor. Two suitable supports for my fan assembly will now be described.

In Figure 6 is shown a hub assembly for supporting the fan. A tubular member 30 provided with a'suitable aperture 32 is provided with a plurality oi.' radially disposed pairs of holes 34, each adapted to receive a spoke-like member 38. These spoke-like members 36 are press-tted into the holes 34. The spoke-like members 38 are arranged in two groups in such a manner that the spokes are paired. Two pairs of spoke-like members 36 have been shown. Each pair supports a transversely disposed blade-engaging 3 member 40 having inwardly directed extensions Y42 ilx'edly attached to the ends of the spoke-like members 38. The main body portion of member 40 is juxtaposed upon one side of a fan blade and spot-welded thereto or secured thereto in any other suitable manner.

In Figures 'l and 8 a modified hub assembly has been shown. A tubular member 50 provided with a longitudinally disposed aperture 52, in which a drive shaft may be mounted, is provided with a pair of annular grooves 54, one in either end. Suitable supporting members 60, each provided with a pair of spoke-like arms 62 formed into V-shape and merging into folded portions 6l project into the annular grooves 54. The spokelike arms 62 are welded to the hub 50 at 56, so as to form a rigid support for the fan assembly. The outer portion of member 60 is curved, so as to snugly engage one side of the fan blade I0, as best seen in Figure 8. Each of the modiilcations disclosed in Figures 6, 7 and 8 shows a suitable supporting assembly for the blower.

Although the preferred embodiment of the device has been described, it will be understood that within the purview of this invention various changes may be made in the form, details, proportion and arrangement of parts, the combination thereof and mode of operation, which generally stated consist in a device capable of carrying out the objects set forth, as disclosed and dened in the appended claims.

Having thus described my invention, I claim:

l. A fan assembly of the centrifugal type including a pair of end rings having tongues struck out from the body thereof and a plurality of blades, each of said blades having undercut notches forming shoulders between which the rings are seated, one shoulder of each blade engaging the inside of the ring, extensions on the blades overlapping the end rings, each extension being provided with an aperture receiving a tongue bent over so as to hold the extensions in position, the shoulders formed by the undercut notches absorbing centrifugal force exerted by the blades when the blower is rotated.

2. A fan assembly of the centrifugal type including a pair of end rings having a plurality of pairs of tongues struck out from the body thereof and a plurality of blades, each of said blades having undercut notches forming shoulders between which the rings are seated, one shoulder of each blade engaging the inside of the ring,

extensions on the blades overlapping the end rings, each extension being provided with an aperture receiving a pair of tongues bent over so as to hold the extensions in position, the shoulders formed by the undercut notches absorbing centrifugal force exerted by the blades when the blower is rotated.

3. A fan assembly of the centrifugal type including a pair of end rings having tongues struck out from the body thereof and a plurality of blades, each of said blades having undercut notches in which the rings are seated, extensions on the blades overlapping the end rings, the ends of the extensions being bent inwardly so as to engage the under side of the ring, each extension being provided with an aperture receiving a tongue bent over so as to hold the extensions in position, the shoulders formed by the undercut notches absorbing centrifugal force exerted by the blades when the blower is rotated.

4. A fan .assembly of the centrifugal type including a pair of end rings having a plurality of pairs of tongues struck out from the body thereof assigns i and a plurality oi' blades, each of said blades having undercut notches in which 'the rings are seated, extensions on the blades overlapping the end rings, the ends of the extensions being bent inwardly so as to engage the under side of the ring, Veach extension being provided with an aperture receiving a pair oi tongues bent over so as to hold the extensions in position, the shoulders formed by the'undercut notches absorbing centrifugal force exerted by the blades when the blower is rotated.

5; A fan assembly of the centrifugal type including a pair of end rings having tongues struck out from the body thereof and a plurality of blades, each of said blades having undercut notches forming shoulders between which the rings are seated, one shoulder of each blade engaging the inside of the ring, extensions on the blades overlapping the end rings, each extension being provided with an aperture receiving a tongue bent over so as to hold the extensions in position, the shoulders formed by the undercut notches absorbing centrifugal force exerted by the blades when the blower is rotated, and a shroud ring press-fitted over the extensions and the portions of the tongues overlapping the extensions so as to conceal the extensions and the tongues, said shroud ring reenforcing the fan.

6. A fan assembly ofV the centrifugal type including a pair of end rings having a plurality of pairs of tongues struck out from the body thereof and a plurality of blades, each of said blades having undercut notches forming shoulders between which the rings are seated, one shoulder of each blade engaging the inside of the ring, extensions on the blades overlapping the end rings, each extension being provided with an aperture receiving a Pair of tongues bent over so as to hold the extensions in position, the shoulders formed by the undercut notches absorbing centrifugal force exerted by the blades when the blower is rotated, and a shroud ring press-fitted over the extensions and the portions of the tongues overlapping the extensions so as to conceal the extensions and the tongues, said shroud ring reenforcing the fan.

'7. A fan assembly of the centrifugal type including a pair of end rings having tongues struck out from the body thereof and a. plurality of blades, each of said blades having undercut notches forming shoulders between which the rings are seated, one shoulder of each blade engaging the inside of the ring, extensions on the blades overlapping the end rings, the ends of the `extensions being bent inwardly so as to engage the under side of the ring, each extension being provided with an aperture receiving a tongue bent over so as to hold the extensions in position, the shoulders formedA by the undercut notches absorbing centrifugal force exerted by the blades when the blower is rotated, and a shroud ring press-fitted over the extensions and the portions of the tongues overlapping the extensions so as to conceal the extensions and the tongues, said shroud ring reenforcing the fan.

8. A fan assembly of the centrifugal type including a pair of end rings having a plurality of pairs of tongues struck out from the body thereof and a plurality of blades, each of said blades having undercut notches in which the rings are seated, extensions on the blades overlapping the end rings, the ends of the extensions being bent inwardly so as to engage the under side of the ring, "each extension being provided with an aperture receiving a pair of tongues bent over so as to hold the extensions in position, the shoulders formed by the undercut notches absorbing centrifugal force exerted by the blades when the blower is rotated, and a shroud ring press-iitted over the extensions and the portions of the tongues overlapping the extensions so as to conceal the extensions and the tongues, said shroud ring reenforcing the fan.

9. A fan assembly of the centrifugal type including a pair of erid rings having tongues struck out from the body thereof, a plurality of blades, each of said blades having undercut notches forming shoulders between which the rings are seated, one shoulder of each blade engaging the inside of the ring, extensions on the blades overlapping the end rings, each extension being provided with an aperture receiving a tongue bent over so as to hold the extensions in position, the shoulders formed by the undercut notches absorbing centrifugal force exerted by the blades when the blower is rotated, anda support for the blades, said support including a hub, a plurality of pairs of spoke-like members xedly attached to the hub, each of said pairs of spokelike members being joined by a blade-engaging member juxtaposed upon one side of a selected blade and spot Welded thereto.

10. Ina fan assembly of the centrifugal type including a plurality of blades, a support for the blades, said support including a hub, a plurality of pairs of spoke-like members flxedly attached to the hub, said spoke-like members being arranged in spaced parallel relation and bladeengaging means having a length greater than the distance between the spoke-like members, said blade-engaging means having inwardly directed projections ilxedly attached to the ends of the spoke-like members so as to provide a. support for the blades. l

11. In a fan assembly of the centrifugal type including a plurality of blades and a support for the blades, said support including a hub, a pair of annular grooves in the periphery of the hub,

pair of supporting rings for the blades, said rings being provided with seats engaging the extensions' for spacing the blades, and a shroud ring clamping the extensions between the supporting ring and tihe shroud ring so as to hold the blades in posit on.

13. In a Afan assembly ofthe centrifugal type said extensions being provided with apertures, a pair of supporting rings for the blades, said supporting rings being provided with projections engaging the apertures in the extensions of the blades for spacing the blades, the ends of the blades being folded about the edges of the supporting rings to clamp the blades in position.

14. In a fan assembly of the centrifugal type including a plurality of blades, each of said blades being provided with a pair of laterally disposed extensions, one extension on each end, a pair of supporting rings, said supporting rings being provided with shoulders engaging portions of the extensions for spacing the blades, the end of each extension being folded around the margin of a ring so as to hold the blades in fixed relation with respect to the rings, and shroud rings overlapping the extensions for clamping the extensions between the shroud rings and the supporting rings so as to hold the blades in a unitary structure.

15. In a fan assembly of the centrifugal type including a plurality of blades, each of the blades being provided with a pair of laterally disposed extensions, the extensions of the-blades cooperating to form a cylindrical surface, each of the extensions being provided with an aperture, a pair of supporting rings mounted in engagement with the extensions, and means extending through the apertures for holding the blades in a relatively xed spaced relation with respect to each other, said last mentioned means being bent over so as to rigidly hold the extensions of the blades.

including a plurality of blades each terminating in a pair of laterally disposed extensions, each of 16. In a fan assembly of the centrifugal type including a plurality of blades, each of the blades being provided with a pair of laterally disposed extensions, the extensions of the blades cooperating to form a cylindrical surface, each of the extensions being provided with an aperture, a pair of supporting rings mounted in engagement with the extensions, and means extending through the apertures for holding the blades in a relatively xed spaced relation with respect to each other, said means overlappingl a portion of the extensions s0 as to reenforce the same.

' ROBERT A. MAYNE.

REFERENCES CITED The following references are of record in the me of this patent: l

UNITED STATES PATENTS Number Name Date 1,062,006 Hessling May 20, 1913 1,333,294 Denton Mar. 9, 1920 1,637,652 Ness 1 Aug. 2, 1927 1,876,518 Mathis Sept. 6, 1932 1,876,871 Doman Sept. 13, 1932 2,157,441 Sullivan May 9, 1939 2,231,063 Evans Feb. 11, 1941 2,240,238 Baker 1 Apr. 29, 1941 2,293,512 L'evy Aug. 18, 1942 

